Look Ahead Left-to-right parse, Rightmost-derivation - ορισμός. Τι είναι το Look Ahead Left-to-right parse, Rightmost-derivation
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Τι (ποιος) είναι Look Ahead Left-to-right parse, Rightmost-derivation - ορισμός

LOOK-AHEAD LEFT-TO-RIGHT, RIGHTMOST DERIVATION PARSER
LALR; Lookahead LR parser; Look-ahead LR parser; LALR parsers; LALR(1); LALR parsing; LALR(2); Look-Ahead left-to-right; LR(*) parser; User:Paulbmann/sandbox; Draft:LALR(k)

Look Ahead Left-to-right parse, Rightmost-derivation      
<parsing, algorithm> (LALR, Look ahead LR) A type of {LR parser} that can deal with more context-free grammars than SLR parsers but less than LR[1] parsers. LALR parsers are popular because they give a good trade-off between the number of grammars they can deal with and the size of the parsing table required. Compiler compilers like yacc and Bison generate LALR parsers. Wikipedia (http://wikipedia.org/wiki/LALR_parser). (2003-05-13)
Right-to-left shunt         
Right to left shunt
A right-to-left shunt is a cardiac shunt which allows blood to flow from the right heart to the left heart. This terminology is used both for the abnormal state in humans and for normal physiological shunts in reptiles.
Right-to-left mark         
BIDIRECTIONAL CONTROL CHARACTER
Right to left Unicode character; RTL marker; RTL character; RTL mark; U+200F; ‏ Right to left mark
‏The right-to-left mark (RLM) is a non-printing character used in the computerized typesetting of bi-directional text containing a mix of left-to-right scripts (such as Latin and Cyrillic) and right-to-left scripts (such as Arabic, Syriac, and Hebrew).

Βικιπαίδεια

LALR parser

In computer science, an LALR parser or Look-Ahead LR parser is a simplified version of a canonical LR parser, to parse a text according to a set of production rules specified by a formal grammar for a computer language. ("LR" means left-to-right, rightmost derivation.)

The LALR parser was invented by Frank DeRemer in his 1969 PhD dissertation, Practical Translators for LR(k) languages, in his treatment of the practical difficulties at that time of implementing LR(1) parsers. He showed that the LALR parser has more language recognition power than the LR(0) parser, while requiring the same number of states as the LR(0) parser for a language that can be recognized by both parsers. This makes the LALR parser a memory-efficient alternative to the LR(1) parser for languages that are LALR. It was also proven that there exist LR(1) languages that are not LALR. Despite this weakness, the power of the LALR parser is sufficient for many mainstream computer languages, including Java, though the reference grammars for many languages fail to be LALR due to being ambiguous.

The original dissertation gave no algorithm for constructing such a parser given a formal grammar. The first algorithms for LALR parser generation were published in 1973. In 1982, DeRemer and Tom Pennello published an algorithm that generated highly memory-efficient LALR parsers. LALR parsers can be automatically generated from a grammar by an LALR parser generator such as Yacc or GNU Bison. The automatically generated code may be augmented by hand-written code to augment the power of the resulting parser.